Cassandra (カサンドラ, Kasandora) Known as the City of Wailing Demons, this mighty prison belonged to Ken-Oh and was under the jurisdiction of the cruel warden, Uighur. Cassandra was used to imprison martial artists who had forfeited their ancient scrolls to Ken-Oh in his goal to create the ultimate martial art. It was also the prison for Raoh's brother, Toki, who Raoh incarcerated as a threat to his conquest.
- The only escape from its walls was death, and it was only once Kenshiro defeated Uighur and his forces, that its terrible legend finally came to an end.
- In the end of the battle with Uighur, he warns that Kenshiro and Toki will never meet before dying of the Hokuto Shinken injuries given to him.
- Uighur says the prison will be reduced to nothingness, meaning wired explosives would tear down the prison soon.
- In the 1986 theatrical movie, Yuria was imprisoned in Cassandra, and it sets the stage for Kenshiro & Raoh's battle.